Question

while driving his car at the speed of 50 km per hour from it covers a distance from home to his office in 1 hour 30 minutes one day he was 15 minutes late from his home in order to reach office at time what should be the speed of the car

Answer 1

Speed = distance / time
given ,
speed = 50 km/hr
time taken = 1.5 hr
distance = x
50 = x / 1.5
x = 75 km
if he was 15 min late,he should cover 75km in 1 hr 15 min = 1.25 hr
speed he drive the car = 75 / 1.25
                                     = 60